This male Brown-headed Cowbird, whom I call Black Beauty, (2 photos) has become a many-times daily visitor to our bird feeder along with his mate. I posted earlier about them but here are better photos of the male, taken yesterday.
They are not very big birds but the male can be aggressive, seen yesterday chasing a larger female Black-headed Grosbeak away from the feeder. They do, however, co-exist peacefully with sparrows or finches at the feeder.
For more information follow the link below to All About Birds.